Moving blocks push players out

As of today's beta version, being inside a block causes the player to get pushed out of it. However, this seems to have broken moving blocks.

Steps to Reproduce:

1. Place a piston/sticky piston facing upwards;
2. Place a block on top of it (also occurs without it, but it is more easily observed with it);
3. Power the piston while standing on top of the block.

Observed Results:
The player gets pushed while the piston is being extended.

Expected Results:
The player only gets moved up with the block, not pushed out of it.

Screenshots/Videos attached: Yes

Notes: